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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5e2a0419ef
We switched to a tree of per-engine HW context to accommodate the introduction of virtual engines. However, we plan to also support multiple instances of the same engine within the GEM context, defeating our use of the engine as a key to looking up the HW context. Just allocate a logical per-engine instance and always use an index into the ctx->engines[]. Later on, this ctx->engines[] may be replaced by a user specified map. v2: Add for_each_gem_engine() helper to iterator within the engines lock v3: intel_context_create_request() helper v4: s/unsigned long/unsigned int/ 4 billion engines is quite enough. v5: Push iterator locking to caller Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190426163336.15906-7-chris@chris-wilson.co.uk
131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2019 Intel Corporation
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*/
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#ifndef __INTEL_CONTEXT_H__
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#define __INTEL_CONTEXT_H__
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#include <linux/lockdep.h>
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#include "intel_context_types.h"
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#include "intel_engine_types.h"
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void intel_context_init(struct intel_context *ce,
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struct i915_gem_context *ctx,
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struct intel_engine_cs *engine);
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struct intel_context *
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intel_context_create(struct i915_gem_context *ctx,
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struct intel_engine_cs *engine);
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void intel_context_free(struct intel_context *ce);
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/**
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* intel_context_lock_pinned - Stablises the 'pinned' status of the HW context
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* @ce - the context
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*
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* Acquire a lock on the pinned status of the HW context, such that the context
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* can neither be bound to the GPU or unbound whilst the lock is held, i.e.
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* intel_context_is_pinned() remains stable.
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*/
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static inline int intel_context_lock_pinned(struct intel_context *ce)
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__acquires(ce->pin_mutex)
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{
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return mutex_lock_interruptible(&ce->pin_mutex);
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}
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/**
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* intel_context_is_pinned - Reports the 'pinned' status
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* @ce - the context
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*
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* While in use by the GPU, the context, along with its ring and page
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* tables is pinned into memory and the GTT.
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*
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* Returns: true if the context is currently pinned for use by the GPU.
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*/
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static inline bool
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intel_context_is_pinned(struct intel_context *ce)
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{
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return atomic_read(&ce->pin_count);
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}
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/**
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* intel_context_unlock_pinned - Releases the earlier locking of 'pinned' status
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* @ce - the context
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*
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* Releases the lock earlier acquired by intel_context_unlock_pinned().
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*/
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static inline void intel_context_unlock_pinned(struct intel_context *ce)
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__releases(ce->pin_mutex)
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{
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mutex_unlock(&ce->pin_mutex);
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}
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int __intel_context_do_pin(struct intel_context *ce);
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static inline int intel_context_pin(struct intel_context *ce)
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{
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if (likely(atomic_inc_not_zero(&ce->pin_count)))
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return 0;
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return __intel_context_do_pin(ce);
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}
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static inline void __intel_context_pin(struct intel_context *ce)
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{
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GEM_BUG_ON(!intel_context_is_pinned(ce));
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atomic_inc(&ce->pin_count);
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}
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void intel_context_unpin(struct intel_context *ce);
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void intel_context_enter_engine(struct intel_context *ce);
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void intel_context_exit_engine(struct intel_context *ce);
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static inline void intel_context_enter(struct intel_context *ce)
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{
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if (!ce->active_count++)
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ce->ops->enter(ce);
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}
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static inline void intel_context_mark_active(struct intel_context *ce)
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{
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++ce->active_count;
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}
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static inline void intel_context_exit(struct intel_context *ce)
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{
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GEM_BUG_ON(!ce->active_count);
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if (!--ce->active_count)
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ce->ops->exit(ce);
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}
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static inline struct intel_context *intel_context_get(struct intel_context *ce)
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{
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kref_get(&ce->ref);
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return ce;
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}
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static inline void intel_context_put(struct intel_context *ce)
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{
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kref_put(&ce->ref, ce->ops->destroy);
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}
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static inline void intel_context_timeline_lock(struct intel_context *ce)
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__acquires(&ce->ring->timeline->mutex)
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{
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mutex_lock(&ce->ring->timeline->mutex);
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}
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static inline void intel_context_timeline_unlock(struct intel_context *ce)
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__releases(&ce->ring->timeline->mutex)
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{
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mutex_unlock(&ce->ring->timeline->mutex);
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}
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struct i915_request *intel_context_create_request(struct intel_context *ce);
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#endif /* __INTEL_CONTEXT_H__ */
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